* * QR Code Generator for PHP is distributed under MIT * Copyright (C) 2018 Bruno Vaula Werneck * * @package QR_Code\Util */ class FrameFiller { public $width; public $frame; public $x; public $y; public $dir; public $bit; /** * FrameFiller constructor. * @param int $width * @param array $frame */ public function __construct (int $width, array &$frame) { $this->width = $width; $this->frame = $frame; $this->x = $width - 1; $this->y = $width - 1; $this->dir = -1; $this->bit = -1; } /** * @param $at * @param $val */ public function setFrameAt ($at, $val) : void { $this->frame[$at['y']][$at['x']] = chr($val); } /** * @param $at * @return int */ public function getFrameAt ($at) : int { return ord($this->frame[$at['y']][$at['x']]); } /** * @return array|null */ public function next () { do { if ($this->bit == -1) { $this->bit = 0; return ['x' => $this->x, 'y' => $this->y]; } $x = $this->x; $y = $this->y; $w = $this->width; if ($this->bit == 0) { $x--; $this->bit++; } else { $x++; $y += $this->dir; $this->bit--; } if ($this->dir < 0) { if ($y < 0) { $y = 0; $x -= 2; $this->dir = 1; if ($x == 6) { $x--; $y = 9; } } } else { if ($y == $w) { $y = $w - 1; $x -= 2; $this->dir = -1; if ($x == 6) { $x--; $y -= 8; } } } if ($x < 0 || $y < 0) return null; $this->x = $x; $this->y = $y; } while (ord($this->frame[$y][$x]) & 0x80); return ['x' => $x, 'y' => $y]; } }